LED in the end strong? New generation of liquid crystal technology

Introduction

With the continuous development of LCD TV technology, LCD TV technology has made considerable progress. From the early stage of the technology of mutual competition, and then to a variety of imaging technology and the wide application of compensation technology, as well as the rise of the use of LED backlight technology. LCD TV is moving towards a comprehensive and stable route.

According to SONY, SHARP, Samsung and other manufacturers launched a flagship LCD TV, all without exception, the use of LE backlight technology. SONY X4500, SHARP XS1A, Samsung F9. In 09 years and after the LCD TV market, LED backlight will serve as a significant symbol, a comprehensive symbol of high-end machine.

By the end of 08, the market in the use of LED backlight technology TV more and more. And the price is much more expensive than ordinary LCD TV, then the use of LED backlight TV than the ordinary LCD TV in the end where strong? What are the advantages? Buy now, the time is ripe? Today, let's talk about it.

LCD TV backlight

According to the type of light source, backlight source mainly has EL, CCFL and LED three kinds of back light source, according to the different position of the light source is divided into side light type and straight down type (bottom backlight).

XS1A series

At present, the majority of LCD TV backlight using CCFL (Cold Cathode Fluorescent Lamps) cold cathode fluorescent lamp. Because the cold cathode fluorescent lamp is not a plane light source, in order to realize the uniform luminance output of the backlight source, the LCD backlight module is also equipped with a plurality of auxiliary devices such as a diffusion plate, a light guide plate, a transmitting plate and the like. Even so, in order to get a CRT like uniform brightness output is still very difficult. Most of the LCD in the display of all white or black screen, the screen edge and center brightness difference is very obvious.

The use of CCFL as a LCD backlight has a headache problem - short life. Most of the CCFL backlight in the use of 2 - 3 years after the brightness of the attenuation will occur, the screen will appear yellow, dark phenomenon.

Ultra long life advantage of LED backlight

LED (Light Emitting Diode) led, after the birth in 1960s was identified as fluorescent tubes, bulbs and other lighting equipment terminator. LED lamp, also known as light-emitting diodes, compared to other light sources, a single LED lamp power consumption is minimal. From blue to red, LED lights have many colors, and a special color is white. We define two kinds of cold white and warm white. In a variety of colors, there is a problem of color deviation, which is more obvious blue and white, especially white, and now LED suppliers can not be effectively controlled.

SONY X4500 series

LED light source is composed of a large number of grid shaped semiconductor, each lattice has a LED semiconductor, so that the backlight on the successful implementation of the LED light source. The flat light source not only has excellent brightness uniformity, but also does not need a complex optical path design, so that the thickness of the LCD can be thinner, but also has a higher reliability and stability.

Secondly, in terms of luminous life, LED backlight technology will be far behind CCFL. Ordinary CCFL backlight life is about 30 thousand hours, some of the top CCFL backlight life but also in about 60 thousand hours. Such a life for the frequent use of users means that the use of 2 - 3 years after the LCD will have to change the brightness of the backlight module. The LED backlight does not exist this problem, at this stage of the white LED backlight life has been up to 100 thousand hours, even if the uninterrupted use of 24 hours, its life can be enough for 5 years. LED backlight color advantage

In terms of color performance, LED backlight is far better than CCFL. The original CCFL backlight because of color purity, poor performance in terms of color. This led to the LCD in gray and color transition as CRT. LED is to make up for the lack of CCFL backlight in the red spectrum, so that the color saturation of liquid crystal products to close to 100% level.

Samsung LA70F91B

Recently, SHARP and SONY have introduced the use of LED backlight technology products. To achieve a high contrast with the plasma TV, a substantial increase in color reduction, while the lighter body. Only the current LED production is higher, and the white light LE devices are monopolized by several major manufacturers, production can not go up, so the price is high.

At present, the LCD TV with LED backlight are basically high-end brands of the machine, the price is slightly higher, the timing of the purchase is not mature. I believe a large number of LED backlight TV, such as the time, the price will be much lower than it is now, then it is wise to move again.